Robert Durst, the notorious multimillionaire scion of a Manhattan real-estate family, wants to collect money from his dead wife’s estate — even though he’s considered a suspect in her disappearance, court records show.

Durst, 69 — pictured above with wife Kathleen — has tried to subpoena two prosecutors and an investigator in the Westchester County District Attorney’s Office to prove the investigation into her disappearance in 1982 is a cold case.

In filing the request, Durst (inset, after his 2004 acquittal in a Texas murder case) is seeking to collect $82,000 that has been held in escrow pending the investigation’s conclusion, his May 9, 2012, petition shows.

“Durst’s professed intention in seeking the subpoenas is suspect,” DA Janet DiFiore wrote last spring in reply to his petition in Manhattan Surrogate’s Court.

She called the request “unprecedented” and “unlawful.”

Durst’s lawyer, Robert Damast, argued in court papers that his client has the right to withdraw the funds and that the case has been cold for three years. Durst wants details on grand-jury deliberations, witnesses and other evidence.

Kathleen’s estate, valued at around $160,000, consisted of investments she made from money Durst supplied, said her best friend Gilberte Najamy, 60.

Half the estate was paid out to Kathleen’s mom and the other was to go to her spouse.

“I’m sure Bobby is the reason for her murder, so any attempt by Bobby to get money from her is, in my opinion, ridiculous,” Najamy seethed. “For a man like Bobby Durst, what is $82,000? It’s just sad.”

Kathleen, 28, a medical student, vanished Jan. 31, 1982, after dining with Durst at their home in South Salem, Westchester.